Fluid dispensing apparatus with cost and volume registers



Dec. 16, 1969 J. H. BICKFORD ET AL 3,484,021

FLUID DISPENSING APPARATUS WITH COST AND VOLUME REGISTERS Filed Dec. 15, 1967 6 Sheets-Sheet 1 F/G. F

I0 I 3 52 w 204 VARlATOR VARIATOR RESET 1 ADJUSTING ADJUSTING CONTROL MECH.

552 48 FIG. 9 M 30/ Lint? 3/2 5/5 M M INVENTORS PROP QNI NG L- 5/5 By ATTORNEYS u E [J WW Dec. 16, 1969 J. H. BICKFORD .ET AL 3,

FLUID DISPENSING APPARATUS WITH COST AND VOLUME REGISTERS Filed Dec. 15, 1967 6 Sheets-Sheet 2 Dec- 1 9 J. H. BICKFORD ET AL FLUID DISPENSING APPARATUS WITH COST AND VOLUME REGISTERS Filed Dec. 15, 1967 6 Sheets-Sheet 3 ZZZ /mmn .JJ -j Dec. 16, 1969 J. H. BICKF'ORD ET AL 3,

FLUID DISPENSING APPARATUS WITH COST AND VOLUME REGISTERS Filed Dec. 15, 1967 6 Sheets-Sheet 4 W4 1mm: m //0 m /Z6 III-Ii I llllllllll W A Dec. 16, 1969 J. H. BICKFORD ET AL 3,484,021

FLUID DISPENSING APPARATUS WITH COST AND VQLUME-REGISTERS Filed Dec. 15, 1967 6 Sheets-Sheet 5 FIG. '7 a 49 Dec. 16, 1969 J. H. BICKF'ORD ETAL 3,484,021

FLUID DISPENSING APPARATUS WITH COST AND VOLUME REGISTERS Filed Dec. 15, 1967 6 Sheets-Sheet 6 PRODUCT w T m L E s US. Cl. 222-26 46 Claims ABSTRACT OF THE DISCLOSURE Fuel dispensing apparatus having a register for registering the cost and volume of fuel dispensed, and a variator for setting the unit volume price with two quickchange range arms and corresponding range arm setting mechanisms controllable by a selector knob and operable to set the range arms when the register is reset. The quick change range arms are adapted to be selectively set into engagement with the steps of a variator input cone gear and with a fixed detent by a specially contoured generally helically extending rack and a pinion driven by a vertically extending range arm setting shaft. A plurality of price cams angularly adjustable on the range arm setting shaft cooperate with corresponding selectively operable pawls to set the angular position of the range arm setting shaft, and the selector knob through a selector cam provides for selectively activating the price cams by withdrawing the pawls from the remaining price cams. During the reset cycle of the register the register reset shaft operates to rotate the range arm setting shaft in one angular direction to load a range arm setting spring which is subsequently tripped to rotate the range arm setting shaft in the opposite angular direction to set the range arm in accordance with the angular position of the active price cam.

A modified variator is shown in FIGS. 7 and 8 in which the quick change range arm output shaft is adapted to be selectively added to or subtracted from the outputs of the remaining two range arms of the variator. A 1 range arm is mounted on the range arm output shaft to selectively rotate a variator summing differential input gear in opposite angular directions. The 1- range arm is controlled by a cam which is set with the selector knob and which is adapted to be adjustably mounted to provide for either adding or subtracting the range arm output at each position of the selector knob.

The computing apparatus may be employed in a blending fuel dispensing system as shown in FIG. 9 wherein the selector knob is employed to select the blend ratio in conjunction with the selection of each of the price cams; or may be employed in a nonblending multiple product fuel dispensing system as shown in FIG. 10. In the nonblending system three separate fuel delivery systems and corresponding control handles are provided for dispensing three separate products, and the control handles are connected to a product selector mechanism to position a price selector shaft and for automatically operating a register reset control mechanism after the selector shaft is positioned. interlocks are provided to permit operating the product selector mechanism with one of the control handles and a switching arrangement is employed for selectively energizing the pump motor nite States Patent "ice and shutoff valve of each of the three separate fuel delivery systems.

BRIEF SUMMARY OF THE INVENTION The present invention relates to fluid dispensing apparatus and to variators having primary utility in fluid dispensing apparatus for varying the price per unit volume of the fluid dispensed.

It is a principal aim of the present invention to provide a new and improved variator of the type conventionally employed in fuel dispensing apparatus for varying the price per unit volume of fuel dispensed and which may be readily reset to readjust the unit volume price.

It is another aim of the present invention to provide a new and improved variator of the type conventionally employing an input cone gear and one or more range arms adapted to be selectively set into engagemernt with the steps of the cone gear for setting the drive ratio of the variator and in which one or more of the range arms may be quickly reset to adjust the drive ratio.

It is a further aim of the present invention to provide a new and improved range arm adjusting mechanism which may be programmed for selectively setting a range arm in any one of a plurality of predetermined positions.

It is a still further aim of the present invention to provide a new and improved quick change variator wherein its drive ratio may be manually selected and thereafter readily set in accordance with the manual selection. When used in a fuel dispensing apparatus the variator is preferably automatically set in accordance with the manual selection during a subsequent reset cycle of the register conventionally employed in fuel dispensing apparatus for registering the cost and volume of the fuel dispensed. The register is conventionally reset just before each fuel delivery and accordingly after the operator has an opportunity to select the variator drive ratio and thus the corresponding price per unit volume to be charged, as for example in conjunction with the selection of a product blend in a multiple blend fuel dispensing system.

It is a still further aim of the present invention to pro vide a new and improved variator adapted for selecting a unit volume price through an extended range. Prices within the extended price range may be pro-established in accordance with the present invention and the pre-established prices may then be selected as for example in conjunction with the selection of product blends in a productblending fuel dispensing system.

It is another aim of the present invention to provide a new and improved variator for fluid dispensing apparatus which provides for an extended range of price adjustment by the adjustment of one of the range arms.

It is a still further aim of the present invention to provide a new and improved variator of the type having an input cone gear and two or more range arms for varying the drive ratio of the variator and in which the output of at least one of the range arms may be selectively added to or subtracted from the summation of the outputs of the remaining range arms.

It is another aim of the present invention to provide a new and improved fluid dispensing system for independently dispensing each one of two or more nonblended products and having a single register for registering the cost of each of the products dispensed and a variator associated with the register adapted to be appropriately set prior to each delivery for setting the pro-established price of the product to be delivered.

It is a further aim of the present invention to provide a new and improved multiple product nonblending fluid dispensing system which employs two or more separate product delivery systems and controls for independently activating each of the delivery systems one at a time. The fluid delivery systems may in accordance with the present invention employ separate dispensing nozzles and separate control handles for activating the corresponding delivery systems, or alternatively all of the products may be dispensed from a single nozzle as for example through a plurality of concentric hoses, one for each product, leading to the nozzle.

It is a still further aim of the present invention to provide a new and improved multiple product nonblending fluid dispensing system having a plurality of separate fluid delivery systems and a single computing device for computing and registering the cost and/ or volume of the fluid delivered.

Other objects will be in part obvious and in part pointed out more in detail hereinafter.

The invention accordingly consists in the features of construction, combination of elements and arrangement of parts which will be exemplified in the construction hereafter set forth, and the scope of the application of which will be indicated in the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:

FIG. 1 is a partial diagrammatic view partly broken away and partly in section of a fuel delivery pump employing a computing device incorporating the present invention;

FIG. 2 is an enlarged elevation view partly broken away and partly in section showing a variator range arm adjusting mechanism of the computing device of FIG. 1;

FIG. 3 is an enlarged plan section view partly broken away and partly in section showing a range arm mechanism of the computing device of FIG. 1;

FIG. 4 is an enlarged side elevation view partly broken away and partly in section of the range arm mechanism and showing a development of a helical rack of the range arm mechanism;

FIG. 5 is an enlarged side elevation view partly broken away and partly in section of the variator range arm adjusting mechanism;

FIG. 6 is an enlarged elevation view partly broken away showing a selector knob and operating handle of the computing device and an interlock arrangement therebetween;

FIG. 7 is an enlarged elevation view partly broken away and partly in section showing a modified variator in accordance with the present invention;

FIG. 8 is an enlarged partial plan section view partly broken away and partly in section of the variator of FIG. 7;

FIG. 9 is a schematic representation partly broken away of a portion of a blending fluid dispensing system incorporating the fuel delivery pump of FIG. 1; and

FIG. 10 is a partial schematic representation partly broken away of a nonblending multiple product dispensing system incorporating the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to he drawings in detail, a computing apparatus 10 incorporating the present invention is shown in FIG. 1 employed in a fuel dispensing pump 11 for registering the cost and volume of the fuel dispensed by the pump. The computing apparatus includes a variator 12 (which is generally of the type described in U.S. patent application Ser. No. 619,408 of Richard B. Hamlin, filed Feb. 28, 1967, and entitled Improved Variator, now U.S. Patent No. 3,413,867) having a rotatable input shaft 14 connected for driving the volume counter 15 of a register 16, and a rotatable output sleeve 18 connected for driving the cost counter 20 of the register 16. An input cone gear 26 of the variator is driven by the shaft 14 and three range arm mechanisms 36, 31, 32 are employed in a known manner for selecting the price per unit volume of gasoline dispensed as, for example, as described in the aforementioned U.S. patent application Ser. No. 619,408. Thus, the cone gear 26 may have nine gear steps and the outputs of the range arm mechanisms may be combined in accordance with the ratio of 1:10: 100 through a pair of adding differentials 36, 38 so that the range arm mechanisms 30, 31, 32 are adapted for respectively setting the first, second and third decimal places of the desired price per unit volume of gasoline.

In the embodiment shown in FIG. 1 the range arm mechanisms 30, 31 are designed in accordance with the present invention for being automatically set with corresponding range arm setting mechanisms 40, and the range arm mechanism 32 is adapted for being manually set in a conventional manner. If desired, however, only one or all three range arm mechanisms could be automatically set in accordance with the present invention. More particularly, and as more fully explained hereinafter, the range arm mechanisms 30, 31 are adapted to be set in accordance with the angular setting of a selector shaft 48 having a selector knob 49. And, after the selector shaft 48 is set with the selector knob 49, the range arm mechanisms 30, 31 are adapted to be automatically set with a register reset shaft 52 when the reset shaft 52 is rotated by a reset control mechanism 54 for resetting the register 16. The reset control mechanism 54 may be an electrically powered reset control mechanism, for example, of the type described in U.S. Patent No. 3,216,659 of E. C. Ambler et al. dated Nov. 9, 1965 and entitled Resetting Control Mechanism for Counting Device; or may be a manually operated control mechanism, for example, of the type described in U.S. patent application Ser. No. 620,108 of E. C. Ambler et al. dated Mar. 2, 1967 and entitled Register Reset Mechanism, now U.S. Patent No. 3,383,016.

Referring to FIGS. 25, the range arm mechanism 30 or 31 is shown comprising a slide 60 mounted for reciprocable movement parallel to the axis of the cone gear 26 on a splined range arm setting shaft 66 and a pair of support rods 62, 64; a range arm 74 pivotally mounted on a range arm output shaft 72 which extends parallel to the axis of the cone gear 26; and a bail 70 (incompletely shown) pivotally mounted on the shaft 72 with the range arm 74 and having at its upper end a gear sector (not shown) for positioning a corresponding price posting wheel 69 (FIG. 1) as described in the aforementioned U.S. patent application Ser. No. 619,408. The range arm 74 comprises a lever or arm 75 mounted for pivotal and axial movement on the shaft 72, a slid ing gear 76 keyed to and axially slidable on the shaft 72 with the arm 75, and an idler gear 77 rotatably mounted on the arm 75 in mesh with the sliding ear 76 and adapted to be selectively positi ned in engagement with the steps of the cone gear 26 and a fixed detent 80 (FIG. 3) by appropriately angularly and axially positioning the arm 75.

The arm 75 has an integral specially contoured generally helically extending combination cam and rack which is coaxial with the shaft 72 and which meshes with a pinion 92 fixed to one end of a transverse shaft 94 rotatably mounted on the slide 60. A bevel gear 96 is fixed to the other end of the shaft 94 in mesh with a bevel gear 98 slidable on the range arm setting shaft 66 so that the shaft 66 is connected to adjust the range arm 74 in accordance with the contour of the rack 90. And, as a result of the coaction of the pinion 92 with the rack 99 the pinion 92 is adapted to vertically raise and lower the range arm 74 as well as pivot the range arm about the shaft 72. Also, the gear ratios of the meshing gears 90, 92 and 96, 98 are selected such that the range arm 74 may be operated between its upper and lower operational limits by rotation of the range arm setting shaft 66 through approximately (but preferably slightly less than) 360.

The combination cam and rack 90 is contoured to pro vide for angularly and axially adjusting the range arm 74 for selectively positioning the idler gear 77 in engagement with the fixed detent 80 and with each of the steps of the cone gear 26. As can be seen upon reference to FIG. 3 in which the operative angular positions of the arm 75 are marked by the numerals 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, representing the upper angular limit position and the ten angular settings (which includes the lower angular limit position) of the arm respectively, the angular displacement of the arm 75 between its ten settings is uneven (although its axial displacement between settings is substantially constant). The combination cam and rack 90, however, is specifically contoured to provide for coordinating the angular and axial displacements of the arm 75 for selectively setting the range arm idler gear 77 in engagement with each of the steps of the cone gear 26 and with the detent 89.

A support roller is mounted on a transverse stub shaft 101 on the slide 66 for engagement with the lower contoured cam edge 163 of the rack 90 for supporting the range arm 74 and for providing appropriate intermeshing engagement of the rack 90 and pinion 92. Also, a detent wheel 102 having suitably angularly spaced peripheral detent slots is fixed on the shaft 94 adjacent the pinion 92 for cooperation with an upstanding fixed detent 194 mounted on the rods 62, 64 for accurately locating and retaining the range arm 74 in its ten settable positions.

For resetting the range arm 74 the slide 60 is initially raised or withdrawn from its lower operating position shown in FIG. 2 to its upper or withdrawn operating position shown in "1G. 4 to disengage the idler gear 77 and the detent wheel 102. The range arm setting shaft 66 may then be rotated to position the range arm 74 for reengagement with a selected step of the cone gear or with the fixed detent 8-0 when the slide 60 is subsequently released to be returned to its normal position by a compression spring (FIG. 2) and the force of gravity If when the slide 69 is released the teeth of the idler gear 77 axially abut the fixed detent 80 or the teeth of the selected step of the cone gear 26, the range arm will subsequently fall in place when the variator input shaft 14 is rotated at the beginning of the succeeding fuel delivery. In addition, the teeth on the idler gear 77 may be axially tapered at their lower end to increase the likelihood of reengagement with the cone gear or detent 80.

Referring particularly to FIG. 5, a number of preset or programmed range arm settings are adapted to be established with a stack of identical price or one-way detent cams 110 (there being four price cams 111! shown in the embodiment described) each having a single peripheral slot 112 adapted to receive the end of a corresponding pawl or arm 114 of a lever 115 and thereby lock the shaft 66 against rotation in the counterclockwise direction as viewed from above. The levers 115 are independently pivotally mounted on a rod 118 and biased into engagement with the respective price cams 116 by torsion springs 119, and a selector cam 120 fixed on a vertical selector shaft 121 is provided with a generally cylindrical surface engageable with the outer rounded ends of arms 122 of the levers 115 for withdrawing the detent pawls 114 from the price cams 111) against the bias of the springs 119. The selector cam 120 also has a plurality of axially and angularly spaced recesses 123 (here four) with an equi-angular spacing of 36 for selectively and individually releasing the detent pawls 114 for engagement with the respective price cams 110 and for there by conditioning the active price cam 110 for setting the angular position of the shaft 66.

The price cams 110 are adapted to be individually angularly adjusted on the shaft 66 at any one of ten positions corresponding to the ten available settings of the range arm 74 by lifting and then rotating each price cam 110 to position its depending post 124 in the appropriate peripheral slot of a corresponding detent plate 126 therebelow. The detent plates 126 are slidable (but not rotatable) on the splined shaft 66 and each is adapted to be raised when a price cam below it is raised. Also, the peripheral slots in the detent plates 126 are appropriately located so that when the shaft '66 is rotated, in the counterclockwise direction as viewed from above, until the active detent pawl 114 is received in the slot 112 of the corresponding cam to restrain the shaft 66 against further rotation, the range arm 74 will be accurately positioned in accordance with the setting of the price cam 110. The price cams may have appropriate indicia on the outer periphery thereof as shown in FIGS. 2 and 5 to assist in setting the cams and, for example, such indicia may be positioned on the price cams 110 for cooperation with a fixed pointer 127 (FIG. 5) when the range arm setting shaft 66 is in its counterclockwise limit position as viewed from above and the range arm is in its corresponding lower limit position.

The selector shaft 48 is connected to the vertical selector shaft 121 by 1:1 bevel gearing 128, 129 so that the selector knob 49 can be set to four 36 angularly spaced positions corresponding to the four available price cams 11f). Referring to FIGS. 1 and 2, the selector shaft 48 is also shown connected through 1:1 bevel gearing 130, 131 to rotate a selector disk 132 for suitably indicating in a window the selection set with the knob 49.

In the shown embodiment, the selector shaft 48 and knob 49 have ten angular positions with an even angular spacing of 36 such that if desired a total of nine price cams 110 could be conveniently employed on the shaft 66, and the remaining position could be employed for resetting the price cams 110 as hereinafter explained. Also, a ten position detent cam 133 is fixed to the selector shaft 48 for cooperation with a combined detent and control lever 134 fixed to a pivot shaft 135 and having a roller or follower 136 engageable with the periphery of the cam 133. Upon rotation of the selector shaft 48 from any previously selected angular position, the lever 134 is adapted to be pivoted upwardly to a withdrawn position shown in FIG. 5 where it is held by a latch 137 pivotally mounted on a fixed pin 138. The lever 134 thereby raises the slide 60' through a linkage 139 which includes a lever 140, shaft 141 and lever 142 to condition the range arm 74 for being reset.

The range arm setting shaft 66 is connected for being rotated, in the clockwise direction as viewed from above, through bevel gears 150, 152, shaft 153, spur gear 154 and gear sector 155 rotatably mounted on the reset shaft 52. A tension spring 156 is connected to the gear sector 155 for biasing the gear sector 155 in the counterclockwise direction as viewed in FIG. 5and to thereby bias the range arm setting shaft 66 in the counterclockwise direction as viewed from above-into engagment with the hub of a drive release lever 158 which thereby provides a stop for setting the lower limit position of the range arm 74. Thus, with the gear sector 155 in engagement with the hub of the lever 158 the price cams 110 may be set with the aid of the indicia on the cams 110 and the pointer 127.

In the shown embodiment the reset shaft 52 adapted to be rotated 360, in the clockwise direction as viewed from the right in FIG. 2, for resetting the register 16 in any conventional manner as for example as described in the aforementioned US. Patent No. 3,216,659. The shaft 52 is rotated through a one-way drive shown comprising a single notch ratchet wheel 160 mounted on a drive shaft 161 driven by the reset control mechanism 54 and a spring biased ratchet pawl 162 pivotally mounted on a plate 164 fixed to the reset shaft 52. The gear sector 155 is in turn adapted to be rotated, in the clockwise direction as viewed in FIG. 5, by the reset shaft 52 through a one-way drive mechanism comprising a drive pawl 166 pivotally mounted on a drive plate 168 fixed to the reset shaft 52 and a ratchet plate 170 fixed to the gear sector 155. The ratchet plate 170 is shown having a single generally V-shaped peripheral notch 172 for receiving the inner end of the drive pawl 166, and a leaf spring 174 having one end secured to a post 175 fixed to the drive plate 168 and its other end connected to the drive pawl 166 biases the drive pawl into engagement with the ratchet wheel 170.

As the reset shaft 52 is rotated 360 from its initial angular position shown in FIG. 5, the drive pawl 166 is adapted to engage the edge 176 formed by the notch 172 in the ratchet wheel 170 to rotate the gear sector 155, in the clockwise direction as viewed in FIG. 5, and to thereby rotate the range arm setting shaft 66, in the clockwise direction, as viewed from above, and raise the range arm 74 to its upper limit position, whereupon a roller 18G engages the outer end of the drive pawl 166 to withdraw the drive pawl and thereby release the gear sector 155 to permit the tension spring 156 to rotate the range arm setting shaft 66 in the opposite angular direction, which rotation is dampened by a dashpot 181 connected to the gear sector 155. The roller 1% is mounted on a lever 182 adapted for limited angular adjustment on the shaft 52 by an angular slot .134 and set screw 186 so that the roller 180 may be properly positioned to withdraw the drive pawl 166 when the range arm 74 reaches its upper limit position.

When the drive pawl 166 is withdrawn from the ratchet plate 170 the shaft 66 and price cams 110 are rotated by the tension spring 156, in the counterclockwise direction as viewed from above, until the active detent pawl 114 is received in the slot 112 of the respective active price cam 110 to restrain the shaft 66 against further movement. The range arm 74 is thereby set in accordance with the pre-established setting of the active price earn 110.

The drive release lever 158 is fixed to the shaft 135 for being pivoted by the control lever 134 such that when the control lever 134 is in its lower inactive position with the roller 136 received in a peripheral recess of the cam 133 the lever 15% is positioned as shown in part in broken lines in FIG. 5 to engage the outer end of the drive pawl 166 and thereby prevent the operation of the range arm setting shaft 66 with the drive pawl 166. Thus, during a register reset operation not accompanied by a prior rotation of the selector knob 49, the range arm setting shaft 66 and the range arm 74 will remain in their previously set positions. If, however, the selector knob 49 is rotated, the control lever 134 will be pivoted upwardly and latched in its upper position and the release lever 158 will be held in its withdrawn position shown in full lines in FIG. 4 to permit the reset shaft 52 to retract the range arm 74 to its upper limit position.

An auxiliary one-Way ratchet wheel 190 is fixed to the range arm setting shaft 66 for cooperation with an auxiliary ratchet pawl 192 to hold the shaft 66 against rotation by the return spring 156 when the active pawl 114 is withdrawn by the selector knob 49. The ratchet pawl 192 is adapted to be withdrawn from the auxiliary ratchet wheel 192 against the bias of a torsion spring 194 by a face cam 196 formed on the plate 164 during the reset cycle and preferably just before the drive pawl 166 is withdrawn by the roller 1%. The face cam 196 is contoured to permit the detent pawl 192 to reengage the auxiliary ratchet wheel 190 at the end of the reset cycle and after the shaft 66 has been set by the selected price cam 110. Also the plate 164 is provided with a peripheral cam lobe 206 (FIG. 5) to engage a roller or follower 262 mounted on the latch lever 137 to withdraw the latch lever at the end of the reset cycle and therefore sui'ficientiy after the detent pawl 166 is withdrawn to permit the range arm 74 to be properly set before the range arm 74 is released for engagement with the cone gear 26 or detent 81 For resetting the price cams 119 on the shaft 66 the selector knob 49 may be set to withdraw all of the detent pawls 114 from the price cams 116 so that during the subsequent resetting cycle the range arm 74 will be set in its lower limit position where the indicia on the price cams 110 will cooperate with the pointer 127 to show the price setting of the cams, thereby facilitating the price resetting operation. Alternatively the range arm 74 may be set in its lower limit position for resetting the price cams 116 by setting the selector knob 49 for withdrawing all of the pawls 114- and by manually with drawing the auxiliary ratchet pawl 192. To facilitate setting the selector knob 49 for resetting the price cams 110 the disk 132 may have suitable indicia on its face which is viewable through the window 125 when the knob 49 is positioned for withdrawing all of the pawls 114 from the price cams 110.

Referring to FIGS. 1 and 6, the reset control mechanism 54 is operated by a handle 203 fixed to a control shaft 294. In a conventional manner the handle 263 may be associated with the storage receptacle of the pump dispensing nozzle 205 so that the handle 203 must be pivoted to its off position shown in full lines in FIG. 6 to permit the nozzle to be replaced in its storage receptacle, and so that the handle can be subsequently pivoted to its on position shown in broken lines in FIG. 6 to operate the reset control mechanism 54 to reset the register only after the nozzle is removed from its storage receptacle.

An interlock is provided between the selector shaft 48 and the control shaft 294 to permit the selector shaft 48 to be set with the knob 49 only when the handle is in its off position and to permit rotation of the handle 203 to its on position only when the selector shaft 43 is in one of its five operational positions (i.e., its four price cam selecting positions and its rice cam resetting position). For this purpose a detent wheel 206 having five detents or recesses 207 is fixed to the selector shaft 48 for cooperation with a spring biased pivotal interlock lever 208 having a roller or follower 209 engageable with the periphery of the detent wheel 206. The opposite end of the interlock lever 208 cooperates with a second interlock lever 210 fixed to the control shaft 204 for locking the control handle 233 in its off position when the selector shaft 48 is in other than one of its five operative positions with the roller 269 received in one of the five recesses 207. Also the interlock levers 208, 210 cooperate to prevent operation of the selector knob 49 when the handle 203 is in other than its 0 position.

Alternatively the detent or recess 211 on the detent Wheel 206 for the price cam resetting position of the selector knob 4-9 may be sufficiently shallow (as shown in FIG. 6) to provide a detent for the knob 49 without releasing the interlock provided by the levers 208. 210. The handle 203 would then remain locked in its off position and the range arm 74 would have to be set in its lower limit position for resetting the price cams 110 by manually withdrawing the auxiliary ratchet pawl 192. Accordingly the pump housing would have to be opened to set the range arm in its lower limit position, and the handle 203 could not be turned to its on position for delivering fuel unless it is in one of its four price cam selecting positions.

The reset shaft 52 could be rotated through 360 'bv an electrical motor (not shown) as in a conventional electrically powered reset control mechanism as described in the aforementioned U.S. Patent No. 3,216,659, to provide for settling the variator and for zeroizing the register when the control handle 203 is turned to its on position just prior to each delivery and after the selector knob 49 is set. Alternatively the reset shaft 52 could be manually operated and for example manually oscillated through less than 360 as described in the aforementioned U.S. application Ser. No. 620,108 so as to provide for manually loading the variator setting spring 156 when the control handle 293 is rotated to its on position and immediately prior to the reset cycle, in which instance the face cam 196 for withdrawing the auxiliary ratchet pawl 192 and the cam lobe 200 for releasing the latching lever 137 would be suitably mounted to provide for timely withdrawing the auxiliary ratchet pawl 192 and for timely releasing the control lever 134 preferably at the end of the reset cycle.

Referring to FIGS. 7 and 8, a modified embodiment of the variator 12 is shown in which one of the range arms 74 is selectively adapted to be added to or subtracted from the outputs of the remaining range arms. For this purpose a 1- range arm 212 is provided for selectively connecting a gear 214 fixed to the associated range arm output shaft 72 to a differential input gear 215. For example, the associated range arm 74 may be the second place range arm and the range arm 212 may be selectively used for adding the output of the range arm to or subtracting it from the summation of the outputs of the first and third place range arms.

The 1 range arm 212 comprises a dual-purpose arm or lever 216 pivotally mounted on the associated range arm output shaft 72 and three idler gears 218, 220, 222 rotatably supported on the arm 216 so that when the arm 216 is pivoted into engagement with a stop 224 the idler gear 218 interconnects the gear 214 with the differential input gear 215 and when the arm 216 is pivoted into engagement with a stop 226, the idler gears 220 and 222 interconnect the gears 214, 215 to drive the gear 215 in the opposite angular direction.

The operative position of the range arm 212 is controlled by a linkage comprising a lever 230 pivotally mounted on a fixed rod 232 and a link 234 pivotally connected to the lever 230 and having an elongated slot receiving a pin 236 fixed to the arm 216. A first tension spring 238 connected to the link 234 provides for biasing the arm 216 to one operative position in engagement with the stop 224, and a ten-position selector cam 240 mounted on a vertical selector shaft 242 is adapted to engage a follower or roller 246 on the end of the lever 230 to pivot the arm 216 into engagement with the stop 226 through the medium of the tension spring 248 connected to the pin 236 and a pin 250 fixed to the link 234. Thus, the arm 216 is adapted to be pivoted to its operative positions through the tension springs 238 and 248, and if the idler gears 218 or 220 do not properly engage the differential input gear 215 when the arm 216 is pivoted to its other operative position, the arm 216 will remain partially withdrawn until the variator input shaft 14 is rotated at the beginning of the following delivery.

The selector shaft 242 is connected to the selector shaft 48 through 1:1 bevel gearing 260, 261 so that the selector shaft 242 and therefore the i selector cam 240 is positioned in accordance with the selected price cam 110. Also, the cam 240 is shown to be angularly adjustable on the shaft 242 through the provision of a plate 264 fixed to the shaft 242 having ten equiangularly spaced peripheral slots 266 adapted for receiving a depending post 268 of the cam 240. The cam 240 is accordingly adapted to be set by raising and angularly positioning it relative to the plate 264 whereby the cam 240 may be selectively positioned for adding or subtracting the output of the asso ciated range arm 74 in conjunction with the selection of one, two, three, or all four price cams 110.

Accordingly, the available range of adjustment provided by the combination of the range arm 74 and the 1 range arm 212 is twice that of the range arm 74 alone and consequently a variator having a single adjustable range arm 74 and an associated range arm 212 may be employed to provide an extended range of adjustment with a single range arm. Thus, if a single quick setting range arm 74 is used for setting the second decimal place of a three place unit price, and if the first place range arm were set at 2 and the third place range arm were set at 9, the quick setting range arm 74 could be used to provide a price range between 219 (e.g., 21.9 cents per gallon) and 399 (e.g., 39.9 cents per gallon). In addition, a greater price range could be provided by adding additional steps to the cone gear 26 and/or greater flexibility could be provided within a more limited maximum price by reducing the price increment of the first place range arm. For example, gearing could be employed such that the first place range arm provides a lower incremental price change of six cents rather than the usual ten cents. The quick setting price range could then be centered on the prices of, for example, 24.9 cents per gallon, 30.9 cents per gallon or 36.9 cents per gallon.

The computing apparatus described could be employed, for example, in a fuel blending system of the type shown in FIG. 9 or in a nonblending multiple product system of the type shown in FIG. 10. Referring particularly to FIG. 9 the selector shaft 48 is connected to a blend setting shaft 300 through 1:1 bevel gearing 301, 302 for setting the blend gearing 303 in accordance with the setting of the selector shaft 48. The blend gearing 303 has a pair of inputs 304, 306 driven respectively by the meter 368 for one of the base products of the blend and by the output of a summing differential 310 connected for adding the output of the meter 308 and the output of the meter 312 for the other base product. The output of the differential 310 is also connected to drive the variator input shaft 14, and the blend gearing output 316 is connected to operate a proportioning valve 318 to control the blend in accordance with the setting of the blend gearing 303 established by the position of the selector knob 49.

A three-product nonblending dispensing system is shown in FIG. 10 in which three separate nozzle storage receptacles 400, 401, 402 are provided for storing three separate nozzles (not shown) for the three products respectively. (Alternatively three concentric hoses for example leading to a single nozzle could be employed in the manner of the pair of concentric hoses conventionally used in blending equipment.) Control handles 403-405 are associated with the nozzle receptacles 400402 for operating the dispensing equipment in conjunction with the withdrawal of the nozzle from and replacement of the nozzle in its storage receptacle. The handles 403-405 are connected to a product selector mechanism 410 through the linkages 412414 respectively such that the selector mechanism 410 is adapted to set the selector shaft 48 in accordance with the handle employed when the selected handle is rotated, in the clockwise direction as viewed in FIG. 10, to its operative or on position shown in broken lines. Also, the product selector mechanism 410 provides for rotating the reset control shaft 204 after the selector shaft 48 is set for resetting the register 16. Alternatively, the selector shaft 48 could be manually set with a selector knob 49 (shown in broken lines in FIG. 10) and/or a single three-position control handle 420 (also shown in broken lines in FIG. 10) could be employed to provide the necessary input to the product selector mechanism 410.

Interlocks 422424 for the linkages 412-414 respectively are provided to inactivate the remaining two control handles when one of the control handles 403-405 is pivoted to its on position. Such interlocks could be employed to lOck the remaining two handles in their inoperative or off positions or to merely disconnect the remaining handles from the product selector mechanism 410.

For purposes of illustration the handles 403-405 and associated nozzle receptacles 400-402 and the corresponding individual delivery systems (each of which is shown including a fluid pump 430 operated by a motor 431, a two-step shut-off valve 432 and a meter 433) are designated with the letters A, B, and C respectively representing the three separate products which may be dispensed. The output of the B and C product meters 433 are combined by an adding differential 440 and the output of the ditferential 440 and the A product meter 433 are combined by a second adding differential 441 which is suitably connected to drive the variator input shaft 14. The pump motors 431 and corresponding valves 432 are adapted to be selectively energized at the end of the reset cycle (i.e., after the variator has been set in accordance with the selected product and the register has been reset) by individual switches 442444 and a master switch (not shown) incorporated in the reset control mechanism 54. More particularly, when one of the control handles 403-495 is pivoted to its operative position the corresponding switch 442-444 is actuated to provide for energizing the corresponding pump motor 431 and valve 432 with the master switch at the end of the reset cycle. Alternatively, in lieu of the switches 442444 a selector switch 459 shown in broken lines in FIG. could be operated by the selector shaft 48 to provide for energizing the appropriate system at the end of the reset cycle.

In order to avoid feedback through the differentials 440 and 441 to the inactive meters 433, suitable locks 456 are provided for selectively locking the meter outputs. These locks could be simple one-way brakes to provide for preventing reverse rotation of the meter output shafts or could be selectively engaged and disengaged by the selector shaft 48 through a suitable brake selector 460. Alternatively the locks 456 could be connected as shown in broken lines in FIG. 10 to be individually released by the linkages 412-414 when the corresponding control handles 403-405 are rotated to their on positions.

The system shown in FIG. 10 incorporates a preset mechanism 461 which may be of the type which is manually operated or money operated to select the amount of fuel to be delivered. The preset mechanism 461 is preferably suitably connected to the register 16 to be operated in accordance with the operation of the cost counter or volume counter of the register and is connected to timely terminate the delivery of fuel with a preset relay 462 and to provide in advance of the termination of the fuel delivery for partially closing the twostage shut-off valves 433 with first-stage control relays 463. Also, the preset relay may if desired be employed to prevent the delivery of fuel until the preset mechanism is set and also to prevent operation of the reset control mechanism 54 if it is electrically powered.

As will be apparent to persons skilled in the art, various modifications and adaptations of the structure abovedescribed will become readily apparent without departure from the spirit and scope of the invention.

We claim:

1. In a variator having multiple step gear means, a range arm pivotally and axially adjustable for selective engagement with the steps of the gear means, and a range arm adjusting mechanism for selectively setting the range arm in engagement with the steps of the gear means, the improvement wherein the range arm adjusting mechanism comprises first control means for the range arm operable for disengaging the range arm from and reengaging the range arm with the selected step of the gear means, and second control means operable with the range arm disengaged from the gear means for selectively axially and pivotally adjusting the range arm for selective engagement with the steps of the gear means, said second control means comprising an arcuate gear coaxial with the range arm axis and rotary setting means including a rotary gear in mesh with the arcuate gear for pivotally adjusting the range arm about its axis.

2. The variator of claim 1 wherein the first control means comprises a slide mounted for reciprocable movement generally parallel to the axis of the range arm and connected to the range arm for axially displacing the range arm out of engagement with the gear means upon movement of the slide in one reciprocable direction from an operating position to a withdrawn position.

3. The variator of claim 1 wherein the second control means comprises cooperating cam and follower means for axially adjusting the range arm in cooperation with the angular adjustment thereof to provide for engagement by the range arm with the steps of the gear means.

4. The variator of claim 3 wherein the cooperating cam and follower means comprises a generally helically extending cam contoured to provide for coordinated axial and pivotal adjustment of the range arm for engagement with the steps of the gear means.

5. The variator of claim 1 wherein the adjusting mecha nism further comprises a plurality of controllers on the rotary setting means respectively operable for angulariy setting the rptary means, and selector means manually operable for individually selecting the controllers for angularly setting the rotary setting means.

6. The variator of claim 2 wherein the adjusting mechanism further comprises detent means for retaining the range arm in engagement with the selected step of the gear means comprising a rotary detent wheel on the rotary setting means and a detent pawl cooperable with the rotary detent wheel to retain the rotary setting means against rotation with the slide in its normal operating position and to permit the setting means to be rotated with the slide in its withdrawn position.

7. The variator of claim 1 wherein the arcuate gear 13 a generally helically extending axially facing rack gear contoured to provide for coordinated axial and angular adjustment of the range arm for engagement with the steps of the gear means.

8. The variator of claim 7 wherein the range arm adjusting mechanism further comprises a slide mounted for reciprocable movement generally parallel to the axis or' the range arm and connected to the range arm for axially displacing the range arm out of engagement with the gear means upon movement of the slide in one reciprocable direction.

9. The variator of claim 8 wherein the multiple step gear means is a cone gear, wherein the range arm is mounted for axial and pivotal movement about an axis generally parallel to the axis of the cone gear, and wherein the rack gear is mounted on the range arm and the rotary gear is mounted on the slide.

10. The variator of claim 1 wherein the adjusting mechanism further comprises manually operable selector means for selecting the range arm setting and connected for operating the first control means to disengage the range arm from the gear means When operated to select a dilferent range arm setting, and means connected for operating the second control means for axially and pivotally adjusting the range arm in accordance with the selected range arm setting.

11. In a computing device for a fluid dispensing system having a resettable register operable for registering the cost of the fluid dispensed in accordance with the established unit volume price of the fluid, a variator connected for operating the register in accordance with a unit volume price established by the variator drive ratio and adjustable for varying its drive ratio and therefore the unit volume price of the fluid, variator adjusting means for setting the variator drive ratio, and register resetting means operable for resetting the register, the improvement wherein the variator adjusting means comprises manually operable selector means for manually selecting a drive ratio from a plurality of available drive ratios, and variator setting means connected for operation by the register resetting means to set the variator drive ratio in accordance with the selected drive ratio.

12. The computing device of claim 11 wherein the variator adjusting means is adapted to be conditioned for setting the variator in accordance with the selected drive ratio, and wherein the computing device further comprises conditioning means connected for operation by the selector means to condition the variator adjusting means for setting the variator in accordance with tie selected drive ratio when the selector means is manually operated to select a different drive ratio.

13. The computing device of claim 12 wherein the variator comprises a multiple step rotary cone gear and a range arm mounted for pivotalv movement about and axial movement along an axis extending generally parallel to the axis of the cone gear for selective engagement with the steps of the cone gear, wherein the variator is adjustable for varying its drive ratio by adjustment of the range arm into engagement with the steps of the cone gear, wherein the variator setting means is operable for selectively setting the range arm for engagement with the teps of the cone gear in accordance with the selected drive ratio, and wherein the conditioning means is conected for operation by the selector means to move the range arm out of engagement with the cone gear to condition the variator setting means for setting the range arm in accordance with the selected drive ratio.

14. The computing device of claim 13 wherein the cone gear has a generally vertically extending axis and steps of diminishing diameter in the upward direction and wherein the conditioning means is connected for operation by the selector means to move the range arm upwardly out of engagement with the cone gear.

15. The computing device of claim 12 wherein the selector means comprises a manually operable rotary selector angularly settable for selecting a drive ratio from the plurality of available drive ratios, and wherein the conditioning means comprises rotary cam means operable by the rotary selector, and cam follower means operable by the rotary cam means and connected for conditioning the variator adjusting means for setting the variator when the rotary selector is rotated to select a different drive ratio.

16. The computing device of claim 15 wherein the rotary cam means comprises a rotary detent cam Operable by the rotary selector, the detent cam having a plurality of angularly spaced cam lobes for operating the cam follower means and intermediate recesses for re spectively receiving the cam follower means at the angular settings of the rotary selector.

17. In the computing device of claim 15 wherein the cam follower means is reciprocably mounted and adapted to be actuated to a withdrawn reciprocable position by the rotary cam means when the rotary selector is rotated to select a diflerent drive ratio and thereby condition the variator adjusting means for setting the variator in accordance with the selected drive ratio, and wherein the conditioning means further comprises retaining means for retaining the variator adjusting means in condition for setting the variator until after the variator setting means is operated by the register resetting means to set t .e variator in accordance with the selected drive ratio.

18. The computing device of claim 11 wherein the register resetting means comprises a rotary member adapted to be rotated for resetting the register, and wherein the variator setting means is connected for operation by the rotary member to set the variator.

19. In the computing device of claim 18 wherein the variator settin means comprises rotary setting means angularly settable to set the variator drive ratio and connected to be rotated in one angular direction by the rotary member, biasing means biasing the rotary setting means in the opposite angular direction for setting the variator, and a plurality of controllers selectively operable by the selector means for selectively limiting the rotation of the rotary setting means in said opposite angular direction.

20. In the computing device of claim 19 wherein the variator adjusting means comprises disengageable drive means interconnecting said rotary member and said rotary setting means for rotating the rotary setting means in said one angular direction, and means for disengaging the disengageable drive means to permit the biasing means to rotate the rotary setting means in the opposite angular direction.

21. In the computing device of claim 12 wherein the variator adjusting means comprises a selectively engageable drive for connecting the adjusting means for operation by the register resetting means, and wherein the conditioning means is connected for operation by the selector means for engaging said selectively engagcable drive when the selector means is manually operated to select a diflerent drive ratio.

22. In the computing device of claim 21 wherein the selectively engageable drive comprises a rotary ratchet wheel and a pivotal pawl engageable with the ratchet wheel for engaging the drive, and wherein the conditioning means comprises pawl control means for withdrawing the pawl from the ratchet wheel to disengage the drive and operable when the selector means is manually operated to select a different drive ratio to permit the pawl to engage the ratchet wheel.

23. The computing device of claim 11 in combination with blend control means adaptable for controlling the blend of a dispensed fluid and adjustable for varying the blend ratio of the dispensed fluid, and wherein the manually operable selector means is connected for adjusting the blend control means for simultaneously setting blend ratios and selecting corresponding drive ratios.

24. In a variator having a multiple step input rotary cone gear, a range arm mounted for pivotal movement about the axial movement along an axis extending generally parallel to the axis of the cone gear for selective engagement with the steps of the cone gear, and a range arm adjusting mechanism for axially and pivotally adjusting the range arm for engagement with the steps of the cone gear, the improvement wherein the range arm adjusting mechanism comprises a slide mounted for reciprocable movement generally parallel to the axis of the range arm, cooperating means on the slide and range arm for axially displacing the range arm out of engagement with the cone gear upon movement of the slide in one reciprocable direction to a withdrawn position and for axially displaying the range arm simultaneously and in accordance with the angular adjustment thereof to provide for engagement by the range arm with the steps of the cone gear, and rotary means connected to the range arm for angularly adjusting the range arm with the slide in its withdrawn position.

25. In a computing device for a fluid dispensing system having a register operable for registering the cost of the fluid dispensed in accordance with the established unit volume price of the dispensed fluid, a settable variator having an output connected for operating the register in accordance with the volumetric amount of the fluid dispensed and a unit volume price established by the variator setting, the variator having at least two variator portions having correspondin intermediate outputs and combining means for combining the intermediate outputs to provide said variator output, at least one of the variator portions being settable to vary its intermediate output and hereby the variator output and the established unit volume price, the improvement wherein said one variator portion comprises adjustable means selectively settable for setting the amount and the negative or positive value of the intermediate output of said one variator portion.

26. The computing device of claim 25 wherein the adjustable means comprises a first adjustable section selectively settable for setting the amount of the intermediate output of said one variator portion, and a second adjustable section selectively settable for setting the positive or negative value of the amount of the intermediate output of said one variatior portion.

27. The computing device of claim 25 wherein the variator has at least two variator portions settable for varying the amounts of their respective intermediate outputs in fixed equal steps respectively, a first of .said settable variator portions being said one variator portion, and the fixed step of a second of said settable variator portions being a whole multiple of the fixed step of said first settable variator portion.

28. The computing device of claim 27 wherein said whole multiple is less than ten.

29. The computing device of claim 26 wherein the variator comprises multiple step rotary input gear means, wherein said first adjustable section comprises range arm means providing a range arm output and selectively settable into engagement with the steps of the multiple step gear means for setting the amount of the intermediate output of said one variator portion.

30. The computing device of claim 26 wherein the second adjustable section comprises a rotary gear, a pivotally mounted combination positive and negative range arm having positive and negative idler gears selectively engageable with said rotary gear by pivoting the range arm to two alternative pivotal positions respectively for selectively setting the positive or negative value of the intermediate output of said one variator portion.

31. The computing device of claim 30 wherein the combining means comprises difierential gear means for combining the intermediate outputs of the variator portions, and wherein said rotary gear is a difierential gear means input gear.

32. The computing device of claim 25 wherein the adjustable means is adjustable for independently setting the amount and the value of the intermediate output of said one variator portion.

33. The computing device of claim 32 wherein the variator comprises a selector having a plurality of operative positions for respectively selecting each of a plurality of available intermediate outputs of said one variator portion, first setting means for adjusting the adjustable means for selectively setting the amount of the intermediate ouput of said one variator portion in accordance with the operative position of the selector, and second setting means for adjusting the adjustable means for selectively setting the value of the intermediate output of said one variator portion in accordance with the operative position of the selector.

34. The computing device of claim 33 wherein said second setting means is presettable for preselecting the value settings for the operative positions of the selector.

35. The computing device of claim 34 wherein the second setting means comprises rotary cam means connected for rotation by the selector and angularly presetable for preselecting the value settings for the operatives of the selector.

36. The computing device of claim 25 wherein the adjustable means comprises rotary gear means and pivotal range arm means selectively settable into engagement with the rotary gear means for varying the intermediate output of said one variator portion, the pivotal range arm means including positive and negative pivotally mounted idler gears selectively pivotal into engagement with the rotary gear means for providing positive and negative value intermediate outputs respectively of said one variator portion.

37. In a computing device for a fluid dispensing system having a register operable for registering the cost of the fluid dispensed in accordance with the established unit volume price of the dispensed fluid, a settable variator having a unit volume output connected for operating the register in accordance With a unit volume price established by the variator setting and variator setting means for setting the variator, the improvement wherein the variator setting means comprises rotary setting means connected for setting the variator in accordance with the angular position thereof, biasing means biasing the rotary setting means in one angular direction for setting the variator, and manually operable selector means having a plurality of manually selectable controllers for limiting the rotation of the rotary setting means in said one angular direction.

38. The computing device of claim 37 wherein the variator setting means further comprises drive means for rotating the rotary setting means in the opposite angular direction against the bias of the biasing means to a withdrawn angular position to permit the biasing means to return the rotary setting means in said one angular direction to set the variator.

39. The computing device of claim 38 wherein the register is resettable, wherein the computing device comprises register resetting means operable for resetting the register and wherein the drive means is connected for operation by the register resetting means.

40. The computing device of claim 39 wherein the register resetting means comprises a rotary reset member rotatable for resetting the register, and wherein the variator setting means comprises engageable clutch means interconnecting the rotary reset members and drive means for rotating the rotary setting means to its withdrawn angular position when the rotary reset member is rotated for resetting the register.

41. The computing device of claim 40 wherein the manually operable selector means is connected for engaging the engageable clutch means when the selector means is operated to select a different controller for limiting the rotation of the rotary setting means in said one angular direction.

42. The computing device of claim 40 wherein said rotary reset member is rotated in one angular direction only for resetting the register, and wherein the register resetting means further comprises an electric reset motor connected for rotating the rotary reset member in its said one angular direction.

43. The computing device of claim 37 wherein the rotary setting means comprises a plurality of coaxial rotary detent wheels; and wherein the manually operable selector means comprises a plurality of coaxial detent pawls adapted for engagement with the rotary detent wheels respectively for limiting the rotation of the rotary setting means in said one angular direction, and rotary selector cam means manually angularly settable for selectively withdrawing the detent pawls out of engagement with the rotary detent wheels respectively.

44. In a multiple product fluid dispensing apparatus having a plurality of fluid meters for measuring the volumetric amounts dispensed of separate fluids respectively, a register operable for registering the cost of the fluid product dispensed in accordance with an established unit volume price for the dispensed fluid, settable variating means operable by the fluid meters for operating the register in accordance with the volumetric amount of the fluid product dispensed and a unit volume price established by the setting of the variating means, connecting means operable for connecting the meters for operating the settable variating means, and control means operable for controlling the fluid product dispensed and for setting the variating means and therefore the unit volume price in accordance with the fluid product dispensed; the improvement wherein the control means comprises separate manually operable selectors for the separate fluids respectively connected for selectively dispensing the separate fluids respectively and for setting the variating means and therefore the unit volume price in accordance with the selector which is manually operated, and interlock means interconnecting the separate manually operable selectors for deactivating the remaining selectors when one of the selectors is manually operated to dispense the respective fluid and set the variating means.

45. The multiple product fluid dispensing apparatus of claim 44 wherein the register is resettable and wherein the apparatus further comprises a reset control mechanism operable to reset the resettable register, and wherein the control means further comprises a selector mechanism connected to be operated by each of the plurality of separate manually operable selectors to set the variating means in accordance with the selector manually operated and to operate the reset control mechanism to reset the register.

46. The multiple product fluid dispensing apparatus of claim 45 wherein the apparatus further comprises fluid pumps and associated electric pump motors for delivering 17 18 the separate fluids respectively, and switching means con- 2,662,417 12/1953 Mascherpa 74-348 X nected to be operated by the manually operable selectors 2,743,622 5/1956 Haupt 22231 X to condition the electric motors respectively for being 2,743,843 5/1956 Bliss 22226 energized when the selectors are manually operated to 2,880,908 4/1959 Young 22226 Operate the selector mechanism to set the variating means 2,886,211 5/1959 McGaughey et al. 222-26 and operate the reset control mechanism to reset the 0 3,054,531 9/1962 Carriol 222--31 X register. 3,232,484 2/1966 Young 222-26 References Cited UNITED STATES PATENTS SAP/FUEL F. COLEh/IAN, Primary Examiner 764,746 7/1904 Mill 74-348 10 986,241 3/1911 Stuhlmacher 74 34s X 2,277,432 3/1942 Groene A- 74-348 X 74-348 

